Industrial Relay Silicon Controlled Rectifier manufacturer / supplier in China, offering PCB Switch, with DIP, Piano and SMT, 1.27mm Pitch, 2.54mm Pitch, PCB Switch, DIP, SMT, 2.54mm, 1.27mm, Tube Package, Reel-Tray Package, Black, Red, Blue Colors, Safety Elevator Light Curtain, Reliable Safety Light Curtain System for Elevators and Escalators and so on.